Bike alarm comes with 1 beep for lock and 2 beeps for unlock.

Only at night, bike alarm Taillight ON.

By default, Taillight ON by vibration, like riding or pushing.

Short-click, Taillight ON continually.

Long-click, Bike Alarm Switch OFF.

Easier to find bike out from parking. 

Equipped with charge cable 2 meters that facilitates to charge assemble alarm.

Bike alarm suits various bike seat tube. To fasten bike alarm well, it comes with 1pc anti-skid rubber and 2pc fixed screw.